15-5PH (UNS S15500 / W.Nr. 1.4545 / XM-12) Precipitation-Hardening Stainless Steel Ring & Hollow Bar

Product Highlights

• 15‑5PH (XM‑12) ferrite‑free martensitic precipitation‑hardening stainless steel ring & hollow bar, UNS S15500 / W.Nr 1.4545, complies with ASTM A693 and AMS 5659 aerospace‑industrial forging specifications
• Cu‑Nb strengthened martensitic PH grade; multiple aging tempers H900 / H1025 / H1075 / H1150 / H1150M, delivers greatly improved transverse toughness compared to 17‑4PH especially for heavy‑section ring‑hollow‑bar forgings
• Ferrite‑free refined microstructure; moderate corrosion resistance comparable to 17‑4PH; fully magnetic after final aging heat‑treatment
• Minimal dimensional distortion during low‑temperature precipitation aging; excellent for large‑size precision ring‑hollow‑bar components requiring tight tolerances post‑heat‑treatment
• Supplied in Condition‑A solution‑annealed soft forging blank for full‑range CNC turning, boring, groove‑machining before aging heat‑treatment; optional VAR vacuum‑remelted ingot for high‑reliability aerospace forgings
• Custom OD, ID, wall‑thickness, height / length; full‑scope CNC processing strictly per customer CAD/PDF drawings
• Premium raw stock for aerospace structural rolled rings, heavy‑section valve‑component hollow sleeves, oil‑gas downhole‑tool forgings, high‑strength fastener preforms and high‑safety‑critical mechanical‑equipment ring‑shaped hardware

Product Overview

This series of 15‑5PH rings and hollow bars are manufactured by hot forging / hot‑piercing extrusion. Vacuum‑arc‑remelted VAR premium ingot is available for high‑reliability aerospace requirements. Material is solution‑annealed and air quenched to obtain homogeneous ferrite‑free martensitic matrix microstructure. Standard delivery is solution‑annealed Condition‑A soft blank ready for rough‑and‑finish CNC machining. Target mechanical‑properties are achieved by subsequent low‑temperature single‑stage or double‑aging precipitation hardening heat‑treatment.

15‑5PH (UNS S15500 / 1.4545, also known as XM‑12) is a ferrite‑free improved variant derived from 17‑4PH precipitation‑hardening stainless steel. Copper‑niobium precipitates provide high strength; its core advantage is superior transverse impact‑toughness in heavy‑section forgings, eliminating delta‑ferrite segregation risk which commonly appears in thick‑wall 17‑4PH parts. Multiple aging tempers can be selected: H900 for maximum hardness and wear‑resistance; H1150M double‑aging for optimized toughness and stress‑relief. Widely processed into seamless rolled rings, hollow‑bar sleeves, heavy‑wall valve‑component forgings and high‑safety‑critical fastener blanks for aerospace, oil‑gas, energy‑generation and high‑reliability mechanical‑equipment industries.

Material Grade Characteristics – 15‑5PH (UNS S15500 / 1.4545 XM‑12)

• Ferrite‑free martensitic precipitation‑hardening stainless steel; strength developed by copper‑rich Nb‑modified precipitate phases after aging treatment; as‑forged condition cannot reach target high‑strength performance
• Multiple standardized aging tempers (H900 / H1025 / H1075 / H1150 / H1150M) for flexible tuning of strength‑toughness balance, outstanding transverse‑toughness advantage for thick‑wall ring‑hollow‑bar forgings versus 17‑4PH
• Corrosion performance comparable to 17‑4PH, suitable for atmosphere, fresh‑water and mild‑chloride environments; not designed for heavy‑acid severe‑corrosion operating conditions
• Very low dimensional shift upon low‑temperature aging heat‑treatment, well‑suited for large‑size precision‑tolerance forged ring‑hollow‑bar parts
• VAR vacuum‑arc‑remelted ingot option reduces non‑metallic inclusions for aerospace critical‑component fatigue‑performance requirements
• Good machinability in Condition‑A solution‑annealed state; welding is feasible, post‑weld full solution‑anneal plus aging is required to restore complete mechanical‑properties
• Fully magnetic after aging heat‑treatment; good wear‑resistance for rotating wear‑ring and bushing‑type hollow‑bar applications

Chemical Composition (Weight %)

表格

Mechanical Properties (ASTM A693 / AMS 5659 Heat‑Treatment States)

表格

Unified Base Delivery Standard: Hot Forged / Hot Pierced, Solution Annealed(Condition A), Air Quenched, Stress‑Relieved, Pickled

Related Material Grades

• PH Stainless Steel:15‑5PH,17‑4PH,17‑7PH
• Martensitic Stainless Steel: 410,420,431,440C
• Duplex / Super Duplex: 2205, S32750, S32760
• Super‑Austenitic: 904L, 254SMO
• Inconel Series: 600,601,625,718,X‑750
• Incoloy Series: 800H/800HT,825,925
• Hastelloy Series:C‑4,C22,C276,B3
• Heat‑Resistant Stainless:253MA,310S
• Alloy Steel:4140,F22,F91,A105

Key Advantages

1 Excellent Transverse Toughness for Heavy‑Section ForgingsFerrite‑free refined microstructure eliminates delta‑ferrite segregation; delivers far superior transverse impact‑toughness compared with 17‑4PH, especially for thick‑wall ring‑hollow‑bar forgings under multi‑axis loading conditions.

2 Multi‑Aging‑Temper Customizable Mechanical‑Properties
Multiple standard aging tempers H900‑H1150M double‑aging; freely balance high‑hardness wear‑resistance versus impact‑toughness for ring‑hollow‑bar forgings according to component‑safety‑design‑requirements.

3 Minimal Distortion After Aging Heat‑Treatment
Low‑temperature precipitation aging creates very small dimensional shift; excellent choice for large‑size precision‑machined ring‑hollow‑bar parts that demand tight tolerances after final aging heat‑treatment.

4 VAR Vacuum‑Remelted Premium‑Ingot Option
Vacuum‑arc‑remelted raw material minimizes non‑metallic inclusions, improves fatigue‑safety‑margin for aerospace high‑safety‑critical ring‑hollow‑bar forgings.

5 High‑Reliability PH Forging‑Grade
Aerospace‑qualified precipitation‑hardening stainless steel, preferred material for heavy‑section high‑safety‑critical ring‑shaped forgings when transverse‑toughness is the key design‑consideration.

Typical Applications

• Aerospace Industry: Structural rolled‑ring forgings, heavy‑wall hollow‑bar component preforms, high‑safety‑critical fastener‑forging blanks
• Oil‑Gas & Valve Industry: Thick‑section downhole‑tool hollow‑bar sleeves, high‑pressure valve‑body ring segments, sour‑service mechanical‑hardware blanks
• Mechanical‑Equipment: Heavy‑load retaining‑ring forgings, thick‑wall bushing‑type hollow‑bar components, high‑safety‑critical wear‑ring preforms
• Energy‑Generation Equipment: Turbine‑component ring‑hollow‑bar blanks, high‑stress structural‑forging parts
• High‑Reliability General‑Industrial Hardware: Multi‑axis‑loaded ring‑shaped forgings requiring strict transverse‑toughness acceptance criteria

Processing Service

We provide integrated hot‑forging / hot‑pierced hollow‑bar & seamless rolled‑ring production, full custom CNC machining per customer CAD/PDF drawings:

• Cut‑to‑length / ring‑height sizing, facing, centering, OD turning, ID boring, chamfering
• Precision threading, internal‑external groove‑machining, cylindrical grinding & surface polishing for ring‑hollow‑bar parts
• Custom multi‑temper aging heat‑treatment service: H900 / H1025 / H1075 / H1150 / H1150M; VAR vacuum‑remelted ingot sourcing for aerospace‑grade requirements
• Pickling, passivation anti‑corrosion surface finishing

We supply 15‑5PH ring forgings, hollow‑bar blanks and fully‑machined components for aerospace, oil‑gas, energy‑generation and global industrial clients.

Quality Assurance

• 100% UT ultrasonic + eddy‑current inspection for forging / piercing internal segregation, inclusion and surface crack defects
• Full‑batch tensile, yield, elongation & transverse Charpy‑impact mechanical‑property testing for each heat lot & aging temper
• Spectrometer full‑spectrum chemical‑composition verification per heat number (strictly check Cu‑Nb key precipitation‑forming elements)
• Metallographic ferrite‑free martensitic‑matrix & copper‑rich precipitate microstructure inspection after aging heat‑treatment, verify absence of delta‑ferrite
• High‑precision micrometer & CMM inspection for OD, ID, wall‑thickness, height / length and dimensional‑tolerance control

Mill Test Certificate EN 10204 3.1 / 3.2 can be issued and delivered together with shipment documents before delivery.

Packing & Delivery

Packing ‑ Inner: Independent anti‑rust plastic sleeve + waterproof film full wrap for ring / hollow‑bar surface scratch protection ‑ Outer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision & deformation ‑ Custom heavy‑duty export packaging for large‑diameter rings & heavy‑wall hollow bars available upon request

Lead Time
Normally 25‑65 working days after receiving advance payment. Exact lead time depends on ring / hollow‑bar dimension, wall‑thickness, melting‑route requirement(VAR), order quantity and custom‑aging‑heat‑treatment / machining demands.

Request Custom Quotation

Please specify part type (ring / hollow bar), melting‑route (air‑melt / VAR vacuum‑remelt), required aging temper(H900/H1025/H1075/H1150/H1150M), OD‑ID‑wall‑thickness dimension and engineering drawings. Our precipitation‑hardening‑stainless‑steel metallurgy team will provide competitive factory price within 24 hours. Free grade‑selection consultation between 15‑5PH and 17‑4PH for your heavy‑section forging‑application!